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It is a matter of course that OSO’s products are operationally stable and safe for the end user. Due to this, certain safety efforts are carried out in addition to full testing of all of our products before they are approved for sales.

OSO’s products go through extensive testing during the product development process. Potential changes when it comes to material qualities or components are stress and performance tested in OSOs heat technological laboratory.


Finished products are also stress tested with 20.000 cycles – equalling the total life span of the product - before it is finally approved for sales.

All finished products undergo a pressure test with water equalling double the normal operating pressure in a house and an electric outgoing control to ensure the quality of the heating element / thermostat and wires.


Final controls of the components are carried out with all of our suppliers in addition to random in-house tests of each delivery. Laboratory inspections of steel and alloy qualities ensure that the materials at all times have the correct specifications.

The final result is the well-known OSO quality that has proved its remarkable lifetime economy through more than 50 years.

Environmental Procedures